Embryonic Cells 
They use the embryo cell for stem cells, this will be a good claim just because it has 2 different views from people. they extract the cell before it starts to grow into a human. 

 http://www.embryonicstemcellresearch.org/

This link explains what embryonic stem cell is and what people think about it as well as the misconceptions people have about the procedure. It can go either way but really nothing is being harmed but at the same time people will think you are harming a human being due to the fact that it's an egg and can become life.  

youtube video: explains embryonic stem cell  

http://www.youtube.com/watch?v=slh88WmR8QA